Not sure about android devices but on my iPhone I used to make sure all other apps are shut down when using the go app. Most of my flying was done in airplane mode as I didn't load maps or use any of the app features needing a mobile service. Interference from all sorts of sources used to kill the app as well. Pretty sure you can fly the drone without using the app as long as you are connected to the phantom wifi. Line of sight obviously and no live feed.